ATO SI&T Lead

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Job Description:

Parsons is seeking a talented ATO System Integration and Test (SI&T) Lead to join our growing team!

In this role you will serve as the technical authority for integrated system security verification and System Integration & Test (SI&T) activities that produce objective evidence supporting Authorization to Operate (ATO) decisions for a next-generation national security space ground segment. 

What You’ll Be Doing: 

• Plan and execute integrated SI&T activities verifying secure system functionality and behavior under operational conditions. 
• Develop SI&T strategies, test plans, and procedures validating secure system operation and mission workflows. 
• Define security verification criteria and objective evidence required for authorization decisions. 
• Coordinate integration of security mechanisms across platforms, networks, and mission applications and verify performance during system-level testing. 
• Oversee security testing events including control testing, vulnerability scanning, penetration testing, and operational demonstrations. 
• Develop and execute negative, misuse, and degraded-mode testing scenarios. 
• Coordinate with engineering and operations teams to resolve defects and close findings. 
• Produce test evidence and reports supporting accreditation artifacts (SSP, SAR, POA&M). 
• Serve as primary interface to leadership and stakeholders regarding readiness and risks​

What Required Skills You’ll Bring: 

• Bachelor’s degree in Engineering, Computer Science, Information Systems, or related STEM field. 

• Active Top Secret clearance with SCI eligibility. 

• 10+ years of experience in system integration and test, verification and validation, or developmental/operational test on national security systems. 

• Experience generating test evidence used in an ATO or equivalent authorization decision. 

• Strong understanding of test engineering, security assessment, and defect management. 

What Desired Skills You’ll Bring:

• Experience supporting space or mission-critical defense systems. 

• Hands-on experience with security testing tools and automated testing frameworks. 

• Familiarity with RMF, SCA processes, and cybersecurity standards.

• Experience supporting IATT-to-ATO transitions or readiness events. 

Security Clearance Requirement:

An active Top Secret security clearance is required for this position.​

This position is part of our Federal Solutions team.

The Federal Solutions segment delivers resources to our US government customers that ensure the success of missions around the globe. Our intelligent employees drive the state of the art as they provide services and solutions in the areas of defense, security, intelligence, infrastructure, and environmental. We promote a culture of excellence and close-knit teams that take pride in delivering, protecting, and sustaining our nation's most critical assets, from E